Modular building blocks



FIG. 1 is a top perspective view of the invention.

FIG. 2 is top view of the invention.

FIG. 3 is a side view of the invention.

FIG. 4 is a bottom view of the invention.

FIG. 5 is a top perspective of a second embodiment of the invention.

FIG. 6 is a top view of the second embodiment of the invention.

FIG. 7 is a side view of the second embodiment of the invention; and,

FIG. 8 is a bottom view of the second embodiment of the invention. 

The ornamental design for a modular building blocks, as shown and described. 